Developer Mode
From AV Scripts Wiki
Developer mode provides clearer error messages, developer tools and stops caching so you can see your changes as you work. Developer mode should not be enabled on live websites that people can access. You should install AVCMS on your local machine or use a server password when in developer mode.
Enabling developer mode
Developer mode can be activated by editing the index.php file.
Within index.php find this line:
define('DEBUG_MODE', false);
And change the false to true.